echinoderm

Noun
  1. Marine invertebrates with tube feet and five-part radially symmetrical bodies (synset 102319359)
    is a type of: invertebrate - any animal lacking a backbone or notochord; the term is not used as a scientific classification
    subtypes:
    • sea star, starfish - echinoderms characterized by five arms extending from a central disk
    • brittle star, brittle-star, serpent star - an animal resembling a starfish with fragile whiplike arms radiating from a small central disc
    • basket fish, basket star - any starfish-like animal of the genera Euryale or Astrophyton or Gorgonocephalus having slender complexly branched interlacing arms radiating from a central disc
    • sea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
    • crinoid - primitive echinoderms having five or more feathery arms radiating from a central disk
    • holothurian, sea cucumber - echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders
    belongs to: echinodermata, phylum echinodermata - radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers
    has:
    • water vascular system - system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration
    • ambulacrum - one of the five areas on the undersurface of an echinoderm on which the tube feet are located
    • tube foot - tentacular tubular process of most echinoderms (starfish and sea urchins and holothurians) having a sucker at the end and used for e.g. locomotion and respiration

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